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<title>第1章           关键术语</title>	
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<h1><a name="_Toc1689"><span lang=EN-US style='font-weight:normal'>第1章<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><span style='font-family:黑体'>关键术语</span></a></h1>

<p class=MsoNormal style='text-indent:18.7pt'><span style='font-family:宋体'>本章节针对手册中提到的所有指标进行了描述：</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>业务系统：是指计算机应用系统，如</span><span lang=EN-US>OA</span><span
style='font-family:宋体'>系统、门户网站。</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>请求：通常指用户发起的一次业务操作。</span><span lang=EN-US>http</span><span
style='font-family:宋体'>服务为点击一个页面；数据库服务为执行一条</span><span lang=EN-US>SQL</span><span
style='font-family:宋体'>语句。</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span lang=EN-US>Apdex</span><span
style='font-family:宋体'>：</span><span lang=EN-US>Application Performance Index</span><span
style='font-family:宋体'>，即应用性能指数。计算公式为：</span><span lang=EN-US>Apdex=</span><span
style='font-family:宋体'>（</span><span lang=EN-US>1 </span><span
style='font-family:宋体'>×</span> <span style='font-family:宋体'>满意样本</span> <span
style='font-family:宋体'>＋</span><span lang=EN-US> 0.5 </span><span
style='font-family:宋体'>×</span> <span style='font-family:宋体'>容忍样本）</span> <span
style='font-family:宋体'>÷</span> <span style='font-family:宋体'>样本总数。</span><span
lang=EN-US>Apdex</span><span style='font-family:宋体'>代表了应用的可用性：</span><span
lang=EN-US>0.94</span><span style='font-family:宋体'>，对应“优秀”级别；</span><span
lang=EN-US>0.85</span><span style='font-family:宋体'>，对应“一般”级别；</span><span
lang=EN-US> 0.70</span><span style='font-family:宋体'>，对应“不满意”级别；</span><span
lang=EN-US>0.50</span><span style='font-family:宋体'>，对应“难以忍受”级别。</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span lang=EN-US>Apdex
T</span><span style='font-family:宋体'>：代表用户对应用性能满意的响应时间界限，如系统默认</span><span
lang=EN-US>0.5</span><span style='font-family:宋体'>秒，满意区间就是</span><span
lang=EN-US> 0~0.5 </span><span style='font-family:宋体'>秒；下一个区间“容忍”的界限值则是</span><span
lang=EN-US> T </span><span style='font-family:宋体'>和</span><span lang=EN-US> 4T</span><span
style='font-family:宋体'>，即</span><span lang=EN-US> 0.5~2 </span><span
style='font-family:宋体'>秒之间为容忍区间；最后一个区间“不满意”的响应时间则大于</span><span lang=EN-US> 4T</span><span
style='font-family:宋体'>，即多于</span><span lang=EN-US> 2 </span><span
style='font-family:宋体'>秒。</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>吞吐量：单位时间内的请求数量。</span><span lang=EN-US>http</span><span
style='font-family:宋体'>服务为</span><span lang=EN-US>hits</span><span
style='font-family:宋体'>，即点击次数；数据库服务为</span><span lang=EN-US>TPS</span><span
style='font-family:宋体'>，即服务器单位时间处理的事务数。</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>平均响应时间：在选定时间段内，所有请求响应时间平均值；</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>独立访客数：当指定协议存在</span><span lang=EN-US>session</span><span
style='font-family:宋体'>时，统计以用户名方式登录的会话数；</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>错误数：在选定时间段内，访问错误的次数；</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>成功率：成功率</span><span lang=EN-US>=100%-</span><span
style='font-family:宋体'>错误数</span><span lang=EN-US>/</span><span
style='font-family:宋体'>请求数；</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>交易量：单位时间内交易的数量；</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>交易响应时间：单个交易发起到结束的时间；</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>交易用户：当指定的交易存在</span><span lang=EN-US>session</span><span
style='font-family:宋体'>时，统计以用户名方式登录的交易相关的会话数；</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>交易错误数：在指定时间段内，交易失败的次数；</span></p>

<p class=MsoListBullet><span lang=EN-US style='font-family:Wingdings'>u<span
style='font:7.0pt "Times New Roman"'>&nbsp; </span></span><span
style='font-family:宋体'>交易成功率：交易成功率</span><span lang=EN-US>=100%-</span><span
style='font-family:宋体'>交易错误数</span><span lang=EN-US>/</span><span
style='font-family:宋体'>交易数。</span></p>

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